I recently used a red Ultimate 100mm pad with my UDM and did not experience any separation. What I did notice though is that the side of the pad is ever so slightly concave in some areas which results in the backing sticking out more than the foam.
I'm still really happy with my purchase though because the 100mm pads stick out far enough from the edges of my polishing pal for me to feel safe about not "tripping" up the pad and accidentally hitting something I shouldn't.
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